The nouns in the sentence are students and teachers.
why should teachers challenge students
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Not in this day and age. You can tickle their brains only!
The breakdown in communication between teachers and students is disrespect. The solution starts with the teachers learning how to behave, instead of reacting to a situation, Behavioral skills are important to teachers and students
Teachers should treat students in the same manner as they would expect students to treat them.
As of 1992-93, there were 835 teachers for 9785 students (http://www.ankn.uaf.edu/IEW/edgreen.html), or about 85 teachers per 1000 students.
It's not clear - I think you mean, "Either the students or the teachers can join." Or perhaps you mean, "Both students and teachers can join."
There are 25 teachers and 487 students.
Other teachers. Students that enjoy learning.
Teachers teach fractions to their students.
Teachers.